847

(1)

4/7 (х - 1) = 2/7 + х

4/7х - 4/7 = 2/7 + х

- 3/7х = 6/7

-х = 6/7 : 3/7

-х = 6/7 * 7/3

-х = 2

х = -2

Ответ: -2

(3)

5 (х - 1,5) = 4 2/3 х - 8 3/14

5х - 7,5 = 4 2/3 х - 8 3/14

5х - 4 2/3 х = - 8 3/14 + 7,5

1/3 х = - 8 3/14 + 7 7/14

1/3 х = - 5/7

х = - (5/7 : 1/3)

х = - (5/7 * 3/1)

х = - 15/7

х = - 2 1/7

Ответ: - 2 1/7